pub struct Transaction<H>(pub Vec<Change<H>>);
Expand description

A series of changes to the database that can be committed atomically. They do not take effect until passed into Database::commit.

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§0: Vec<Change<H>>

Implementations§

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impl<H> Transaction<H>

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pub fn new() -> Self

Create a new transaction to be prepared and committed atomically.

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pub fn set(&mut self, col: ColumnId, key: &[u8], value: &[u8])

Set the value of key in col to value, replacing anything that is there currently.

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pub fn set_from_vec(&mut self, col: ColumnId, key: &[u8], value: Vec<u8>)

Set the value of key in col to value, replacing anything that is there currently.

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pub fn remove(&mut self, col: ColumnId, key: &[u8])

Remove the value of key in col.

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pub fn store(&mut self, col: ColumnId, hash: H, preimage: Vec<u8>)

Store the preimage of hash into the database, so that it may be looked up later with Database::get. This may be called multiple times, but subsequent calls will ignore preimage and simply increase the number of references on hash.

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pub fn reference(&mut self, col: ColumnId, hash: H)

Increase the number of references for hash in the database.

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pub fn release(&mut self, col: ColumnId, hash: H)

Release the preimage of hash from the database. An equal number of these to the number of corresponding stores must have been given before it is legal for Database::get to be unable to provide the preimage.

Trait Implementations§

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impl<H: Clone> Clone for Transaction<H>

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fn clone(&self) -> Transaction<H>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<H: Default> Default for Transaction<H>

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fn default() -> Transaction<H>

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl<H> RefUnwindSafe for Transaction<H>where H: RefUnwindSafe,

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impl<H> Send for Transaction<H>where H: Send,

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impl<H> Sync for Transaction<H>where H: Sync,

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impl<H> Unpin for Transaction<H>where H: Unpin,

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impl<H> UnwindSafe for Transaction<H>where H: UnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.